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Steel Making

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Annealing Work
With the exception of several of the higher types of alloy s...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Hardness Testing
The word hardness is used to express various properties of me...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Gears
The material used for all gears on the Liberty engine was sel...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Bessemer Process
The bessemer process consists of charging molten pig iron int...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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